Crystal structure of EHEC O157:H7 intimin mutant

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Crystal Structure of EHEC Intimin: Insights into the Complementarity between EPEC and EHEC

Yi, Y.Ma, Y.Gao, F.Mao, X.Peng, H.Feng, Y.Fan, Z.Wang, G.Guo, G.Yan, J.Zeng, H.Zou, Q.M.Gao, G.F.

(2010) PLoS One 5: e15285-e15285

  • DOI: https://doi.org/10.1371/journal.pone.0015285
  • Primary Citation of Related Structures:  
    3NCW, 3NCX

  • PubMed Abstract: 

    Enterohaemorrhagic E. coli (EHEC) O157:H7 is a primary food-borne bacterial pathogen capable of causing life-threatening human infections which poses a serious challenge to public health worldwide. Intimin, the bacterial outer-membrane protein, plays a key role in the initiating process of EHEC infection. This activity is dependent upon translocation of the intimin receptor (Tir), the intimin binding partner of the bacteria-encoded host cell surface protein. Intimin has attracted considerable attention due to its potential function as an antibacterial drug target. Here, we report the crystal structure of the Tir-binding domain of intimin (Int188) from E. coli O157:H7 at 2.8 Å resolution, together with a mutant (IntN916Y) at 2.6 Å. We also built the structural model of EHEC intimin-Tir complex and analyzed the key binding residues. It suggested that the binding pattern of intimin and Tir between EHEC and Enteropathogenic E. coli (EPEC) adopt a similar mode and they can complement with each other. Detailed structural comparison indicates that there are four major points of structural variations between EHEC and EPEC intimins: one in Domain I (Ig-like domain), the other three located in Domain II (C-type lectin-like domain). These variations result in different binding affinities. These findings provide structural insight into the binding pattern of intimin to Tir and the molecular mechanism of EHEC O157: H7.

  • Organizational Affiliation

    Department of Clinical Microbiology and Clinical Immunology, College of Medical Laboratory, Third Military Medical University, Chongqing, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Intimin adherence protein
A, B
189Escherichia coli O157:H7 str. TW14359Mutation(s): 1 
Find proteins for P43261 (Escherichia coli O157:H7)
Explore P43261 
Go to UniProtKB:  P43261
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP43261
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.771α = 90
b = 92.488β = 90
c = 100.048γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-01-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Refinement description